The number of echoes combined into a single image or image set in multiple echo imaging sequences or echo-train techniques such as rapid acquisition with relaxation enhancement (RARE), fast-spin echo (FSE), and turbo spin-echo (TSE). In RARE imaging, the ETL typically equals the acceleration factor.
As for tooth pain, it is caused by a reaction of the nerves inside a tooth's pulp chamber with the severity dependent upon the type and degree of the stimulus. What follows are some examples of symptoms you may be feeling and their possible causes.
Report Abuse. yes, you can get tooth aches caused by stress. You an get spasms of the muscles used for chewing when you are suffering from stress, but it might be a red flag warning heart problems also. Sometimes, a toothache may be caused by a problem not originating from a tooth or the jaw.